Shelf unit



FIG. 1 is a rear perspective view of our new design for a shelf unit;

FIG. 2 is a front perspective view thereof;

FIG. 3 is an enlarged rear view thereof;

FIG. 4 is a right side view of FIG. 3, the left side view being a mirrorimage;

FIG. 5 is a top view of FIG. 3; and,

FIG. 6 is a bottom view of FIG. 3.

The ornamental design for a shelf unit, as shown and described.